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2 Analysis Because the compressor inlet pressure and temperature are fixed for reason to minimize the compressor work as was explained in the introduction chapter, an analysis of certain parameters influence on cycle efficiency was performed. The parameters correspond to relevant cycle: - turbine pressure ratio rT (all cycles) - turbine inlet pressure (all cycles) - turbine inlet temperature (all cycles) - ratio of pressure ratio rpr (pre-compression, re-compression, partial cooling) - dividing pressure (split expansion) - pre-compressor inlet temperature (pre-compression) - recuperator efficiency (improved regeneration) In this basic design others parameters were hold constant: - compressorefficiency89% - turbineefficiency90% - recuperator efficiency 95% - turbine inlet temperature 550°C - compressor inlet temperature 32°C - pressure losses are neglected A mathematical model of each cycle was worked out for purpose of analysis. The calculation itself was made in code of VISUAL FORTRAN6.5 with usage NIST subroutines for evaluating of CO2 thermodynamic properties. Computed data were elaborate and plotted in MS EXCEL. 2.1 The Cycles Comparison From results of each cycle analysis were selected for comparison those with high thermal efficiency and wide range of pressure ratios. An effect of varying compressor outlet pressure and pressure ratio was observed. The results from analysis for particular pressure 10, 15, 20, 25MPa of each cycle are plotted into a graph and correspondent comment is below the graph. 0,50 0,48 0,46 0,44 0,42 0,40 0,38 0,36 Brayton Split expansion Precompression Recompression Partial cooling Improved regeneration 2 2,2 2,4 2,6 2,8 3 3,2 3,4 3,6 3,8 4 Turbine Pressure Ratio [-] Figure 2.1 Results of analysis for turbine inlet pressure 10MPa Thermal Efficiency [-]PDF Image | 2009 TECHNOLOGY INNOVATION WINNERS
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